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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca66a54dbf2f0646d466627c837321bd2de063d722978ca0c71af29742b691a' 
  AND token = 'hyqKEkyXdC0qD6jW1YUrAFu9awOMCPjuxlM9YdHKojg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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