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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7684eee3c69240b02bcf254955ae5b19373a9c344b4b3c837aacba61937ed8' 
  AND token = 'k5X02z1SyRHf+Vt/1ulF8gkeicBFK9cEcS/Le+ovXHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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