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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a61953f0dc713f9f6323ca902124fd8ad8c30c0b42d4911439c4afeba31967' 
  AND token = 'oi/HfbJ3EH/Og/J1oZb8TgUa/zeoRq8pHHtaD89P2Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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