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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deeaba0c8e9d503151970e931469f077814faeec034450b86e42992b48b98bc5' 
  AND token = 'evr0qr8nG3xQLr7/E/j6x85DeQ8jv7up/O7vqxS4IL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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