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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe4b1b1900cb90fd8c2c26b40de491bca0c85c62189812dca2d8103c3b311f' 
  AND token = 'AteQxRUvUE25vBhnzHVM/e3jdcvCkZJP/LmoOLGVn5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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