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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204f5ddd2f05d922f8ec96f7bb8332a7a1299dc0d045ffbaaecc21c2a337fdb5' 
  AND token = 'q3oWapWMXrHON3q2HD/gvBnM86vybrZg9Mt4fQDI+0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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