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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23abac673072370ecfcc6689101f4f9f130f8086c2b0efc4997865c8391de1f2' 
  AND token = '5VrXyusz0W+HVFGwc/JWHHwctK9yyjI5Xh/Q0NaNj5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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