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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c793afafc636aff87c8d482baadb9a834cce58c94a61e043fcc7734097828126' 
  AND token = 'r8C+C3h9/Zjpr+UVGesNRs40l8v7wZeUJtbBf3Cb1v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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