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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e525aa3ad129540081c4a698b8fb1d639e92b85dfaaf037e8f632073e9084b' 
  AND token = 'Ohxd28ipXzmXecqrDLGfN7f+Tev9baJV/gkhb+6d7nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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