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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995db5bc143bd6ac9400ff389541ef6c3355ddd7fa5dd26574e228b03af5c752' 
  AND token = 'AlLMjdp40/7Yjl0shnEgJ4mxwiSLuubQcas8wHw72A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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