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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f554d39b754323ae1f7ccfab627754c4fd085e81f03e093d0f83d7455175856' 
  AND token = 'pSJuV7nc9x3EQ8SKigWywmxCxicTGJxnYApFOXoJ/TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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