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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52eb23858ac478111058ae96cf160d67aa33391b09fa95d560fdaf7cb5c75889' 
  AND token = 'MIteNbW5nxhm7qIqM4Gws6r5wuFD+sG10JW0CcIsdgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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