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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b0cadca05659f06c805831063483d3629db90217597c3550f732b3ad2da94f' 
  AND token = 'z8V9kqO7OIoypAPlNOdM7cK0WUqm1RtPDCeveVmp84w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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