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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa3c0aae32f05be4cc26961024710b84a0ac504c7ca2d90eba9bd68b2eeaf58' 
  AND token = 'uOeIN5TMfkfcsUjysYVSDy10dqWZ73YldtP+j7R4+Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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