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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55621d887654aeaa317e694d16ab9d07bf748170f65b809f1e90609602d626a4' 
  AND token = 'lvH2tlcx7suY+357bvWCxzlvE3kIxsfQQfR0jRlxyMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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