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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89db4c587db58cac15cd2afda65fe8bbe559187b84580182e2f5041690a27621' 
  AND token = 'cttdFzOuiFU406rfLov6Od3CMUsHGVEeU2qtZr4AO2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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