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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4bc453490c707686d6035b2525391c186e2bf71406da0fc3d79f8c0e5368de' 
  AND token = 'GANlnrvdBJW+f8u/0ojL73Nx4fPhkim15jxkbE4ptGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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