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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c75d6c3ed17760394c51821173cea3548f8fa2d0b753238195f03af3bc1e4' 
  AND token = 'KFBJNnNVeeETB+FyLpwwL4H9BY1N25pTyVX7C77wq/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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