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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad78a94d15b9bd2e2132d1f28ecde594b91d502f7e8b39dc400afb60d7823650' 
  AND token = '/7STJcQh7WuXwNHHAGRBDb55zf0ugK6hrrH4i7gtG3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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