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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd858463e315e88dfd502d41f43de4a234925722e1a5247a7139837daedfa0b' 
  AND token = 'CfVlvmZgNMTEwMV3nok3ZbaepTXVd9tL4D074nT4+dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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