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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bc87481ae06dc4758ab6d480d512c6a68d1431aa8e86ebb6ad2941e3787eac' 
  AND token = 'fo1pygubuExnVKARnzyLgeOwwai4jtTUGtE5LzbCMAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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