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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6855f511672bcd78b2336b32b8f0ff8489b381587f3c30ffd9b8028e8ab01024' 
  AND token = 'lAk5nNNnNtQD9h0Ag1dJbcE/q51Thfgnglk/7rdTofE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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