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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fc341d45a91bbdba3f7a39938185c63ce357c75ed62fd26db415a8697e34b3' 
  AND token = 'M1IWadkp6Hj7tpEtzLNMG6Ynq+Snz8qnr5GMyiPsRK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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