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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff44abd56c33895035aa0a1e9c64d848df1d5a7c5ddb0a9a1e84d1169711c11' 
  AND token = '0qIYjgEXPotP7VaBwLX3X363SAMPo3XITC3S7PPpWwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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