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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a6c3bebeb7a03920335edcda5b83b1f6408afa27daba73a4148dca5f4f7cee' 
  AND token = '0ERleYM2HJj3KXZrW03mA9sR1wDKlheyAeR1xFWoIr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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