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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367701880c11665273289f21a25bd6e0361c7f5f752506968f246edab40571cf' 
  AND token = 'tQaDK11mlO8y0iT9CQFD5QLzj4TDeQmK0K2enoCLKWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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