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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53130763561c4227bab2e63f924c0677277e9cb75439961461738f8929242dcc' 
  AND token = '2sYn5OOq73sWJtI4ppeX8Z7tHU342jUlOe3Hz0CAWQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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