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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d2c098a1e7c587c6f0bbec39e5782439af62ad2edb86d7fc9e5ac9efda9302' 
  AND token = 'NTYhCblk7Q822mD23v0Dbh5vO/Zre+ip1SamFpFelHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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