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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c85e99ac83ae8ed5b583c47c45c6135134538fb7c163a0366442a8fbeca588' 
  AND token = 'rOBMem/PdjskcsSr4H9ffNf32J5mfzrJUeeFfdZ5QCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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