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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d6f0a08ef7a1cacc111e37e7cd7039971a36c05b020f4066109d1596f05c84' 
  AND token = 'uoHibnAsiQHKT9OMnafXMK9WLQpEHoGvSM/O6piI/E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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