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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0927ceceaa9220373227f206e7f493e25173e75f5c87561431fdd59d0463ccc6' 
  AND token = 'xM3wOV1mzSm6e6JndDgp8w7T7Oe0lnG4zOtk0SXGqHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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