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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386e478e359b585278fd37f9e44afda5b8f77fb83ad43d7e30649a012a7358d9' 
  AND token = '44HjsNMGB21ma0p2ikiWYtyzc5BReczzp11vmN6k+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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