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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8120c9d5d94b18b5aebe7d52366e31bc2c07ebf67d47e2b724e8fdfee316b7' 
  AND token = 'YjLAkL96C1ASXYXTXZNAoqRhNJklXxd4hZa49wBLgx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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