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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2115fdcbe3c83540ef5b76c5642022e950d2947bd71da179d68759eb3124594c' 
  AND token = '3Z98rE4eEvO2bXghU20R71LkpzVbIb95xXumK+9oAO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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