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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9de36cbe9c92e67a2b137059fbcd4abcc92fef0bed462d79b3b9af350d8c8b' 
  AND token = 'Podp/hDEVQEvEd3Y0GcIwFDBmDoaa9ZaOJ9x6J4koSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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