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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c673e9d2966fd0f3b22b1f0a26e03378535ecbd72582d349ad4fc0b76d85c8' 
  AND token = 'cV+b+EKDMLCm68ibmm0chZct7np7KR3ERbkcSDM9wd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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