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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba11e6aa466e4308d282617ecfbbce1dd77dc6e11341badea33ffae6f21ff9e' 
  AND token = 'PB9Z/1/X1zh2GGnuqeP32CSmCI3sCiiU8L07DIJo5mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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