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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7929657f320a811c93787ca7f0d71362483b80d9e0c598c9ce417cd973f03faa' 
  AND token = 'I7y6oo5N8P7S0blqJGkYmpUTBkJVI5GAJVzZjZJdXWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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