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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ba08b5bc18d0e655ee9d5bb22eabd9e265ba14253b2a702b0f4ca9bf2dc00d' 
  AND token = '6BvBLyfFo4hNszIHLymyLxgDeIZklFknmES+7hTSWY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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