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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85d58609f826127a784efdb5fe7fe882b1c5ba7fcc3a9087d8b4976362014e1' 
  AND token = 'sG0nol1o4XqBM2zkCii5vlcnhoe/JkCNfASZi8B7u9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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