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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a102e6cb50ebb1b309a7e86fdd56f9b2a819871f60a54db82f6d8d3f480e32a' 
  AND token = 'kRi0Ng62b/4I6K75Xu/clq12LZBxN3KStvS9wOOqqDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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