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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575f0e4f68edc116cfe760fd06cbf105b3b094c2f3c640203056134be284c6ba' 
  AND token = '/wdN71qDwwg94wDtiBp/zqpLe3nBCVyvL8flPAcXWKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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