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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461d65ca7be4e0fa9809782d4f2ffde61bb892db9dc7d6e191b9369dda16b058' 
  AND token = '1sG62c6Y/Wh6Iaz5LnTtjyHco9hSpNHyCJCSBugQF00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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