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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5edcb56033bb88a60e853c4c73f6e45b7f3648fb4ca774e584638bdc7fbd6d' 
  AND token = 'HTl9OV7WNhiXIVxTnrLIkw4XA7LEMsOmtY1sisInldk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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