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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed43dd6e733e34427fc1d2b8854f34f20ab28ed2897d3d2c5fcf5938fbbfc285' 
  AND token = 'fgslPkZyxXlmKspY52H4ntqQ6v/fIEo7vRD5qo/KiiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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