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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ffedf96e0fcefb9d5ba788b5a8070384fba6bd02057400026a679a02198a02' 
  AND token = 'PyIJAw+arC3Rppto+XnH6Q7wzHR4GiFherN/ATRdcC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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