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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37344c694988818f0149ef41f55471197ce413cdcd2c1e29f8295a8253f892a0' 
  AND token = '+8AN7KyH+WkNHlxOLxc/QZuBHjBilTdckMpDcOMzI1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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