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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765773c87096b904687d924c2956b0e46e572c8beebbae645a980b71fed7d8af' 
  AND token = 'oA79i06OYPEc+R3bMH+Lp4y9TOXBWgbNAVAkde2KodQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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