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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683da09b4af2f40ac3d9ab64f1453640cede13c6bb854da3b007217b61d37bcd' 
  AND token = 'BBXuDN4+3X1ECPQiZ5sk4yF5VBhjUUIgBzWUbpE8pXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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