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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7036603bebf97c1617ed86f494ef94689ceb4539f9b417e604fe2a4cccf8033' 
  AND token = 'CRBPKRTLI2iV5Bg4eAJ5+u/gq+PGsNE6tyGz0uQCf2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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