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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c5403f7a23d6f323232c7f77fc7ca5b036c5ed1b446341211b413589094c4e' 
  AND token = '/xHAICsjxceUbglO6b0FQUj7GNMkSTwpQuiSluyhzEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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