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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d7a856382d4031a1b545d6635ee498979a6a729ac61d4dcfc3223d7776a33f' 
  AND token = 'ebkMGatDXvid53yfJCzYdi0anpDHoNmCn9Yr+HKt/v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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