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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872558bbee1480c69dd9cf12b11e282987be1dee056d62ea3bbb0c47b1e86f7d' 
  AND token = 'nGNPUnH4sWpX2Yb88MPsOla3rNmfnN93xYa9cRma3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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