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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f136393453f3cd8a4270e55dd864e9959b17cf1d76f9f1e27f537f2739a870' 
  AND token = 'PWtJEKxNPCWjY2llRJC9A763nnRetWN+wrmofe9NU3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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