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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed4d533dd5c0bb90092d53ec876cd62380784a5a55bbdbb06c46c8b5a9fa3f' 
  AND token = '9Jc8sgsR8PBct/RZcT2MzfuzfHOKNs/M1my0VmkpXs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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