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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f7ae48d2adedcccdeb6954d422dc747f740c7bb9235e43e465804e55f00ef6' 
  AND token = 'gylSTcCaWFXgtXzNWnFWiGgsy6GAGJAE6UFd7hoCEho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}