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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a085556c12eac76a0d94bc88915f1a66220f24afd94c4f5531fc66a7d77770b' 
  AND token = 'iqXtFA1uQQoUJxrbxkrcZrwO4jgTqI7whCSUjCtD4VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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