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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff3e87fd51399ef18bfa498155634031469e93ec77a67ab600d67a11c1af99a' 
  AND token = 'lqXF9n/d8MJL9f27HAKbPgh7GZQM8WHNw/Zv86YM7/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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