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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a82be3fd708b37aa1db879e7091e4205347ccdb45e6edaddfff9c3476390ba3' 
  AND token = 'baddHfDBfGvUfOM6als/9/YBOwhqsIvP+JOsaXzW8Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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