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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea54be7b10f553b769940773d8963e5c6a7eba4acdd415393a32f3d0a79ac34' 
  AND token = 'bbD3gzJEtUtD37nwMDBWtnS/f5e0HY3AUPNxQFT9yLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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